Into the tabernacle; which was not required nor allowed in any other sacrifice, possibly to show the greatness of the high priest's sin, which needed more than ordinary diligence in him and favour from God to expiate it.
Related Commentaries of Leviticus 4:5
Leviticus 4:5
5 And the priest that is anointed shall take of the bullock's blood, and bring it to the tabernacle of the congregation: